Alias Prequel Series by Lynn Mason, Laura Peyton Roberts

A crumbling Gothic mansion on a craggy Scottish isle.A secret meeting among the world’s most powerful underground organizations. And lots of bad blood.Sydney’s sent by SD-6 to pose as the heiress of a former ruling family of Romania now mixed up in the black market. Except instead of collecting intelligence, something goes very wrong. One by one people end up disappearing. Gone. Vanished. When someone is found, they’re dead. Will Sydney be the prime suspect . . . or the newest victim?

Sydney is back on audio to kick some serious bad guy butt! Alpha Kappa Chi Sorority sister Jen Williams has recently died of "natural causes." Turns out that Jen was also a rookie agent for SD-6. AKX is spending spring break in Waikiki, and Jen was supposed to undertake an important mission for SD-6 there. But now Jen is dead, and it's up to Sydney to infiltrate the sorority and carry out Jen's Hawaiian mission...and find out what really happened to her spy sister.